Which Telescope, Schmidt Cassegrain or Refractor?

[JohnSadlerAstro]

15 minutes ago, ollypenrice said:

There will never be anything 'easy' about imaging with an F2 system whose light cone is so steep as to make the focal depth only a matter of microns. 

The person designing that must have forgotten their physics. ? F/2!!! ? That is just stupid. I wonder if it has a 1:1,000 focuser.  

John

[AGF]

Hi Olly,

Thank you for this information re: Hyperstar / SCT.  I remember reading somewhere that narrow-band filters can't be used and focusing is more difficult and time consuming. Something to do with the sensor and mirror alignment. I don't fully understand this yet but will need to look further. Swapping it back and forth is something I had not thought about. Perhaps a dedicated system is required for Hyperstar only! As I said before, this is very low on my wish list at the moment because of budget constraints and I may never get to experience these issues, however, gaining knowledge is part of the long learning curve I have set myself and I've still got a long way to go... 

Anthony

 

[AGF]

John, Olly,

OK, I'm convinced! Hyperstar has now gone further down, but not yet fully disappeared, from my list of desirable imaging accessories! But, 'never say never' .

Thanks

Anthony

[AGF]

Apologies - double posting of same content